Taylor Swift Performs 'I Want Crazy' with Hunter Hayes! (Video)

Taylor Swift performs with surprise guest Hunter Hayes during the final stop on her Red Tour on Saturday evening (September 21) at the Bridgestone Arena in Nashville, Tenn.

The 23-year-old entertainer was joined by Hunter, 22, to sing his hit song “I Want Crazy.” Check out the video below!

“Thank you to @HunterHayes for driving everyone CRAZY with ‘I want crazy’!! The crowd went INSANE for him and I loved every minute. #redtour,” Taylortweeted.

“Show highlight: @edsheeran dressed like a clown and danced the choreography to We Are Never Ever Getting Back Together. Quite the finale,” Taylor added. Check out the photos of her tourmate Ed Sheeran as a clown below!